The Research Of Three-dimensional Flow In Diesel Helical Intake Port

The process of intake charge is the linchpin of an engine's work circulation.The structure of intake port directly affects the power, economy, the strength of swirl and flow coefficient in the diesel engine in the intake system. Compared with the traditional design method which depends on experience and test, the three-dimensional numerical simulation has the below traits: short time, easily getting value parameters and information of microcosmic fluid field.With the computer technology's improvement, Computational Fluid Dynamics (CFD) also has gradually become mature and been used more and more to simulate intake port. At present, the CFD software such as: Fire, Fluent, which be applied widely at home and abroad, all is accurate software. This thesis chooses the Fluent to simulate the intake port.In this paper, the author mainly does below work:1. Summarizes the different methods of intake port design and finite element theory;2. Compares and summarizes different appraisement means of intake port;3. Introduces the Pro/e, Gambit and Fluent;4. Mentions the fluid science rules and models;5. Builds and analyses the three-dimensional model of 6105QB.In the meantime, applies appraisement means of Ricardo to analyses the capability parameters. Applies Microsoft Visual C++6.0 to write program to calculate capability parameters (swirl ratio, flow coefficient).6. Analyses the swirl rates of different valve lift and gives the particular information of fluid field and the opinions for improvement;The data is comparatively logical, in the meantime it has direction meaning and can help shorten exploitation period and reduce research outlay and boost research efficiency of new production.